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arXiv 2303.01044nucl-th
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壳效应与激发能的猝灭对核能级密度的影响

Impact of the quenching of shell effects with excitation energy on Nuclear Level Density

Mamta Aggarwal

摘要:

我们调查的性质和壳效应对核能级密度(NLD)和粒子发射概率作为温度的函数的微观理论框架的统计模型的核,从缺中子到富中子同位素Z $=$ 27 $-$ 35的影响。临界温度跟踪相邻的偶数,奇数,封闭的壳层和中间$-$壳核,响应不同的激发,由于其不同的稳定性和结构的影响。壳层效应和壳层修正能的重要性在NLD变化中得到了明显的反映,NLD变化随激发能的增加而缓慢减小,表明壳层效应的猝灭。LD参数随形变和旋转的增强以及增强随激发强度的衰减。N $=$ 28在质子滴线附近磁性减弱的现象在反能级密度参数“K”($=$ A/a)和$β$变化中已被观察到,尽管这种现象在激发核中并不常见。我们计算的奇数$^{69}$ As和偶数$^{70}$ Ge的NLD的变化表现出结构效应,并与实验值的变化非常一致。我们评估的水平密度参数“a”值与RIPL-2(参考输入参数库)的数据进行了比较,显示出良好的一致性。

英文摘要:

We investigate the nature and impact of shell effects on nuclear level density (NLD) and particle emission probability as a function of temperature in a microscopic theoretical framework of Statistical Model for nuclei ranging from neutron deficient to neutron rich isotopes of Z$=$ 27$-$35. Critical temperatures are traced for neighbouring even, odd, closed shell and mid$-$shell nuclei which respond to excitations differently due to their varying stability and structural effects. Importance of the shell effects and shell correction energy is reflected significantly in NLD variation which slowly diminishes with increasing excitation energy indicating the quenching of shell effects. The enhancement of LD parameter with the deformation and rotation and the fade out of enhancement with increasing excitations has been shown. The weakening of magicity of N$=$28 near the proton drip line has been observed in the inverse level density parameter 'K'($=$ A/a) and $β$ variation though it is usually uncommon to see this effect in excited nuclei. Variation of our calculated NLD for odd $^{69}$As and even $^{70}$Ge exhibits structural effects and agrees very well with the variation of experimental values. Our evaluated level density parameter 'a' values are compared with RIPL-2 (Reference Input Parameter Library) data which show good agreement.

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